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- Eye piece or ocular lens is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes.
- This optical instrument is named so because it is usually the lens that is closest to the eye when someone looks through the device.
- In this, objective lens or mirror collects light and brings it to focus creating an image.
- The eye piece consists of several "lens elements" in housing, with a "barrel" on one end. Different eyepieces vary in size, focal length and design as per the application.
- The simple designs give acceptable performance and in some cases even phenomenal performance.